Fig 4A. [doi:10.1073/pnas.0402819101] Twigg SR; Kan R; Babbs C; Bochukova EG; Robertson SP; Wall SA; Morriss-Kay GM; Wilkie AO, Proc Natl Acad Sci U S A 2004 Jun 8;101(22):8652-7. [PMID:15166289] Copyright 2004 National Academy of Sciences, U.S.A.